Office 2013 app that extracts semantic information and statistics from text.

Tag documents and presentations in SharePoint libraries with keywords and metadata and make them easier to find.

WikiDo is a meta search engine designed to help people find things to do. It uses OpenCalais to analyze some contents and extract topics and social tags, that are useful for the comprehension of the web-pages.
The current Beta is limited to the USA.

Tagaroo automates tag generation for WordPress bloggers.

All content (Articles, blogs, image galleries, static pages) created within the Vortal CMS is scanned by OpenCalais for semantic meta data and displayed on the client’s website as clickable tags linking to other related stories.

Twittweb.com - gathering realtime news.
 

An experiment in automated event tracking. Uses OpenCalais for categorisation and Reverb for information extraction.